x22+c\frac{x^{2}}{2}+c2x2+c
−1−x2+c-\sqrt{1-x^{2}}+c−1−x2+c
1−x2+c\sqrt{1-x^{2}}+c1−x2+c
−1−x2-\sqrt{1-x^{2}}−1−x2
